查询词典 random function

The paper also points out that, modern logistics can restructure and upgrade the regional industries by means of the effect of industrial relevancy when it serves for the social production and residents living, engenders new industries and enhances the internal proportions of the third industry. By integrating related functional operations, modern logistics is able to change the links between the knots and lines from random and loose connection to a kind of spatial structure of smoothness and steadiness, with which block and friction would be lessened and the function of regional economic constituents amplified while the regional income and the strength would be improved as a whole. Through intensifying the advantage of allocation of the centers of region, modern logistics induces regional elements of development to move towards advantageous locations while bringing key urban cities effects of scale economy and agglomeration economy, it then can be regarded as an operational platform for potentiating the growing polar of urban cities and boosting up the developing level of hinterlands, and an effective measure to balance urban and rural development and development among regions.

论文认为，现代物流在为社会生产和生活服务、形成新的产业形态、改善第三产业内部比例关系的同时，通过产业关联带动效应促进区域整体产业结构的优化升级；现代物流通过整合相关功能性活动，将经济网络中节点与线路之间随机连接、松散联系转变为顺畅交流、稳定合作的空间构造，从而减少区域经济运行中的阻滞性因素，放大区域经济发展要素的功能，提高区域经济系统整体效益和经济实力；现代物流通过强化经济中心的区位优势，促进区域经济发展要素向优区位运动，给经济中心城市带来规模效应、聚集效应和扩散效应，是强化中心城市增长极地位和提升经济腹地发展水平的操作平台，因而也是统筹城乡发展和区域发展的重要手段。

In the article we at first discuss the kind of stock log-return distribution. We find that 7 kinds function can describe stock log-return form their works: Gausses of normal distribution, Levy distribution, t distribution, spike attitude distribution, random fluctuating model, ARCH-GARCH model, divide shape Brownian movement .

本文首先讨论了股票收益分布的种类，作者对前人的工作综合发现目前描述股票收益的函数大概有七种：高斯正态分布、利维稳定分布、t标度分布、尖峰态分布、随机波动率模型、ARCH—GARCH模型、分形布朗运动，我们分别对这七种函数进行了简要的介绍。

The probability density function of non-following headway and formulations of random variables of two kins of traffic flows are deduced.

本文以爱尔朗分布为基础，将高速公路上车辆分为队状跟车和非跟车两种类型交通流，用大量实地观测数据检验分布的特性，推导出非跟车流车头间隔的概率分布函数和仿真用的两种交通流的随机变量公式。

First, the stations'timing process and the slot aligning are discussed. Second, the dissertation propose a resource request random access method based on feedback. The performances of this method are analyzed. Third, proceed from the considerations of the MAC protocol for the HFC system, a QOS-oriental scheduling algorithm for the MAC protocol based on dynamic TDMA is proposed. Simulation results show that the performance of this algorithm is better than that of the first come first service. Forth, two contention resolution algorithms ----p-persistent CRA and tree CRA, which are usually adopted in the HFC system, are summarized. The delay and characteristic are compared. At last, the dissertation introduces the function implementation of the MAC layer based on COM21 UPSTREAMS.

首先，讨论了基站的同步进程和时隙同步的实现；然后，本文提出了一种带反馈模块的资源申请信号随机接入方法，并对其进行性能分析；然后，从HFC系统的MAC协议出发，提出了一种用于基于动态TDMA技术的MAC协议的业务安排算法，计算机仿真结果表明其性能优于先到先服务法的性能；然后概述了常用于HFC系统的两种冲突解决算法——p-坚持冲突解决算法和树型冲突解决算法，比较两者的时延性能与特征；最后，介绍了基于COM21 UPSTREAMS协议的MAC层功能实现，给出了硬件框图和照片。

The research of lift-off velocity distribution function of saltating sand grain would redound to solve the random problem of single lift-off sand grain from sand bed and promote the combination between microcosmic researches and macroscopical researches of Aeolian sand movement.

沙粒起跳初速度分布函数的研究成果将有助于解决在错综复杂的沙床面上单颗沙粒运动的随机性问题，初步实现微观与宏观研究的结合；跃移沙粒降落速度分布函数对于反演跃移沙粒与沙床面碰撞的恢复系数，深入理解碰撞过程具有十分重要的意义，同时也将促进击溅函数的修正工作。

From the analysis of automobile vibration sources and the human responses to vibration, a mechanic model of man-chair-vehicle system with 13 degrees of freedom is built by vibration pattern analyzing technology. Using the random vibration theory, the calculating methods are developed for parameters, including vibration pattern, transfer function, wheel transient load, and acceleration of seat, automobile ride quality simulation software is developed.

通过分析汽车振动源和人体对振动的反应，用模态综合技术，建立了十三自由度人－椅－车系统的动力学模型，运用随机振动理论，给出了振动形态、传递函数、悬架动挠度、车轮动载荷、座椅加速度等参量的计算方法，开发了一套&汽车平顺性仿真软件&并利用已有的汽车数据，对汽车行驶时的振动特性进行了仿真，得到了重要结论：发动机与轮胎刚度、阻尼，后桥阻尼对驾驶员座椅处的振动影响不大；驾驶员座椅的垂直刚度增加很大时，对垂直方向振动响应比较大；前桥刚度、阻尼对驾驶员座椅处的振动影响较大；前轮胎刚度对前桥振动影响较大，前轮胎刚度增加，则振动加强；后桥刚度对汽车平顺性有一定影响，后桥刚度减小，则座椅处垂直加速度减小。

Influences of the conditions, such as seed value of randomizer, the form parameter of statistical distributing function m, cell number, stress strain state, if there are weak areas in the center of specimens, limit conditions, random evaluating method of material factor on the elastic-plastic failure process of rock specimen are discussed.

分别研究随机数发生器种子值、统计分布函数的形态参数m、单元数目、应力应变状态、试样中心有无弱区、边界条件、材料参数随机赋值方式等条件对岩石试样弹塑性破裂过程的影响。

Default 1 Unit - Symbol Equation Function RandomNumberIni Parameter that initiates the randomiser for determining the random mid position for a certain plant.

默认值 1 单位-符号方程式作用 RandomNumberIni 初始随机数的参数，用于确定某植被的随机中点位置。

According to the fractal dimension, the disturbed distance between upper and lower fracture surfaces and the ratio of area contact (the proportion of contact area to whole area of fracture) of fracture, the random Brown Function is used to generate a rough-walled fracture with position-dependent aperture.

根据裂隙面分形维数、裂隙面位错值和裂隙面上的面积接触率，用随机布朗函数生成裂隙的开度分布。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。